This carb may have been fubar'ed to the point that it will never tune in for you- there are so many things that may have been done to it, besides just the "V"-cuts, that I just don't know if it's worth pursuing.

Choice is yours, however. If you think all that's been modded on it is just the primary blades, at least you can swap them out.

Get the butterflies or the complete baseplate from an old core carb or the butterflies from Gesslers. You will also need new screws.

To get the old screws out, the back side has to be ground smooth to the throttle shaft because the screws are peened to prevent them from coming loose while in use. They will then not be reusable. A dremel makes this job easy.

If you replace the butterflies, this would be a good time to bush the throttle shaft. Cliffs has the kit for this, as well as just the bushings.